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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

Ex 11.2, 5 A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of Rs 16 per 100 cm2. Here we will tin-plate the inside of the hemisphere So, We need to find the curved surface area of hemisphere Radius of hemisphere = r = /2 = (10.5/2) cm = 5.25 cm Curved surface area of the hemisphere = 2 2 = (2 22/7 5.25 5.25) cm2 = 173.25 cm2 Cost of tin-plating 100 cm2 = Rs 16 Cost of tin-plating 1 cm2 = Rs 1/100 16 Cost of tin-plating 173.25 cm2 = Rs 1/100 16 173.25 = Rs 27.72 Cost of tin-plating the hemisphere is Rs 27.72

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.